kdumpctl: make the kdump.log root-readable-only
    
    Resolves: bz2111857
    Upstream: Fedora
    Conflict: None
    
    commit 4edcd9a4001f684d6c5b66afc2e164bdd6a296eb
    Author: Lichen Liu <lichliu@redhat.com>
    Date:   Wed Aug 24 16:16:14 2022 +0800
    
        kdumpctl: make the kdump.log root-readable-only
    
        Decrease the risk that of leaking information that could potentially
        be used to exploit the crash further (think location of keys).
    
        Signed-off-by: Lichen Liu <lichliu@redhat.com>
        Acked-by: Coiby Xu <coxu@redhat.com>
    
    Signed-off-by: Lichen Liu <lichliu@redhat.com>